Add from_{address,name} configuration parameters

[ecerulm]

closes: #17930

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[uranusjr]

This conficts with #18042. We should figure out a conhesive plan on what exactly to do here.

[ecerulm]

I didn't realized that someone else was working on a PR, I opened issue #17930 on 2021-08-31 and that issue was assigned to me by @potiuk so I when I got around to preparing this PR on 2021-09-13 I didn't even think of searching for other PRs. So feel free to close this one.

[uranusjr]

I feel this PR is still valuable though, and the two PRs’ different implementations should be combined together into one cohesive solution. The previous PR (#18042) fills out the email field with the SMTP email config, which I’ve never been completely comfortable with, but the new email field introduced by this PR makes the Airflow config contain two distinct sets of email configurations, which would be very confusing to users. Perhaps the best way to combine the two would be to

1. Add the new email_from configs (but I don’t think it’s necessary to have separate fields from_name nad from_email; the email field can already contain a display name by default, e.g. John Smith <john.smith@example.org>, so we only need one field (maybe with a better example and documentation so users know how to use it better).
2. Make smtp_mail_from optional and default to the from_email setting; the user can still set smtp_mail_from if needed to override this default only for SMTP.
3. Use email_from in the SES implementation.

This is only my initial thought and other ideas are definitely welcomed. @ecerulm and @ignaski you two can also discuss which one of you should take the lead on this one and /or how to split work between.

[ecerulm]

For me it's ok if @ignaski takes over.